实现折半查找java代码
时间: 2024-06-12 21:09:44 浏览: 7
折半查找(Binary Search)是一种在有序数组中查找指定元素的算法。以下是一个用Java实现的折半查找的代码示例:
```java
public class BinarySearch {
public static int binarySearch(int[] arr, int target) {
int left = 0;
int right = arr.length - 1;
while (left <= right) {
int mid = left + (right - left) / 2;
if (arr[mid] == target) {
return mid;
} else if (arr[mid] < target) {
left = mid + 1;
} else {
right = mid - 1;
}
}
return -1;
}
public static void main(String[] args) {
int[] arr = {1, 3, 5, 7, 9};
int target = 5;
int index = binarySearch(arr, target);
if (index != -1) {
System.out.println("Element found at index " + index);
} else {
System.out.println("Element not found");
}
}
}
```
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